1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 302-1:2013Adhesives for load-bearing timber structures T e s t m e t h o d sPart 1: Determination of longitudinal tensile shear strengthBS EN 302-1:2013 BRITISH STANDARDNat
2、ional forewordThis British Standard is the UK implementation of EN 302-1:2013. It supersedes BS EN 302-1:2004, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e P R I / 5 2 , A d h e s i v e s .A list of organizations represented on this
3、committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013.ISBN 978 0 580 75255 1 ICS
4、 83.180 Compliance with a British Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 302-1:2013EUROPEAN STAN
5、DARD NORME EUROPENNE EUROPISCHE NORM EN 302-1 March 2013 ICS 83.180 Supersedes EN 302-1:2004English Version Adhesives for load-bearing timber structures - Test methods - Part 1: Determination of longitudinal tensile shear strength Adhsifs pour structures en bois - Mthodes dessais - Partie 1: Dtermin
6、ation de la rsistance du joint au cisaillement en traction longitudinale Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 1: Bestimmung der Lngszugscherfestigkeit This European Standard was approved by CEN on 5 February 2013. CEN members are bound to comply with the CEN/CENELEC Internal Reg
7、ulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN mem
8、ber. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
9、CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland
10、, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form an
11、d by any means reserved worldwide for CEN national Members. Ref. No. EN 302-1:2013: EBS EN 302-1:2013EN 302-1:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 6 2 Normative references 6 3 Terms and definitions .6 4 Symbols 7 5 Principle 7 6 Apparatus .7 7 Method 7 7.1 Preparation of panel
12、s 7 7.2 Preparation of the bonded assemblies8 7.2.1 Wood adherends and bonding procedure 8 7.2.2 Close contact glue .9 7.2.3 Thick glue lines (gap joints) .9 7.3 Preparation of test pieces .9 7.4 Number of test pieces 10 7.5 Treatment prior to tensile shear testing . 10 7.6 Test procedure 11 8 Expre
13、ssion of results . 12 9 Test report . 12 9.1 The adhesive . 12 9.2 Preparation of test pieces and testing procedure . 12 9.3 Test results 12 Bibliography . 14 BS EN 302-1:2013EN 302-1:2013 (E) 3 Foreword This document (EN 302-1:2013) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, t
14、he secretariat of which is held by AENOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2013 and conflicting national standards shall be withdrawn at the latest by September 2013. Atte
15、ntion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 302-1:2004. The following modifications have been made: Two ne
16、w clauses (Terms and definitions and Symbols) are introduced in this revised standard; Thick glue line is now prepared with thicknesses between 0,3 mm and 2,0 mm depending on type of adhesive; There has been given more detailed instructions on how to prepare thick glue line; The condition period for
17、 bonded assemblies has been increased. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugo
18、slav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 302-1:2013EN 302-1:2013 (E) 4 Introduction
19、 This document is one of a series dealing with adhesives for use with timber structures, and is published in support of EN 1995, Eurocode 5: Design of timber structures. The series consists of three classification and performance requirements for adhesives for load-bearing timber structures, phenoli
20、c and aminoplastic adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerised isocyanate adhesives (prEN 16254), together with eleven test methods (EN 302 Parts 1 to 7 and EN 15416 Parts 2 to 5). These European Standards have the following titles: EN 301, Adhesives,
21、 phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 15425, Adhesives One component polyurethane for load bearing timber structures Classification and performance requirements prEN 16254, Adhesives Emulsion polymerized isocyanate (EPI) for loa
22、d-bearing timber structures Classification and performance requirements EN 302, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength Part 2: Determination of resistance to delamination Part 3: Determination of the effect of acid damag
23、e to wood fibres by temperature and humidity cycling on the transverse tensile strength Part 4: Determination of the effects of wood shrinkage on the shear strength Part 5: Determination of maximum assembly time under referenced conditions Part 6: Determination of the minimum pressing time under ref
24、erenced conditions Part 7: Determination of the working life under referenced conditions EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 2: Static load test of multiple bondline specimens in compression shear Part 3: Creep deformation tes
25、t at cyclic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly time for one component polyurethane adhesives Part 5: Determination of conventional pressing time Safety statement Persons using this document should be familiar with the normal laboratory pr
26、actice, if applicable. This document cannot address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. BS EN 302-1:2013EN 302-1:2013 (E) 5 Envi
27、ronmental statement It is understood that some of the material permitted in this standard can have a negative environmental impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from this standard to the greatest extent possible. At the end of t
28、he test, it is recommended that the user of the standard take care to carry out an appropriate disposal of the wastes, according to local regulations. BS EN 302-1:2013EN 302-1:2013 (E) 6 1 Scope This European Standard specifies a method for determining the shear strength of adhesive bonds in close c
29、ontact glue line and thick glue line. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301, EN 15425 and prEN 16254; b) for assessing the suitability and quality of adhesives for load-bearing timber structures. This test is intended primarily to obt
30、ain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This method is not intended for use to provide for structural design, and does not necessarily represent the performance of the bonded
31、member in service. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (
32、including any amendments) applies. EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 923:2005+A1:2008, Adhesives Terms and definitions ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (c
33、onstant rate of traverse) Specification ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 and the following appl
34、y. 3.1 glue line adhesive layer between the wood members 3.2 thick glue line glue line of nominal thickness in the range of 0,3 mm to 2,0 mm at the time of bonding Note 1 to entry: Thick glue lines are achieved by using spacers, grooves or similar devices with a thickness of 0,3 mm to 2,0 mm when tw
35、o plain members are glued together. 3.3 close contact glue line glue line of thickness maximum 0,1 mm BS EN 302-1:2013EN 302-1:2013 (E) 7 Note 1 to entry: Close contact glue line is achieved by pressing together two plane wood members with a clamping pressure of (0,8 0,1) N/mm without additional gro
36、oves, spacers or similar devices. 4 Symbols A bonded test surface, in mm; fvshear strength, in N/mm; Fmaxthe applied load at failure, in N; h depth of groove for thick glue line, 0,3 mm, 0,5 mm, 1,0 mm or 2,0 mm; angle between the annual growth rings and bonded surface, 30 to 85; l1length of test pi
37、eces, (150 5) mm; l2length of overlap (length of tested surface), (10,0 0,1) mm; l3width of groove for thick glue line, 14 mm; b width of test pieces, (20,0 0,1) mm; t thickness of panel for close contact glue line, (5,0 0,1) mm; t + h thickness of panel outside the grooves for thick glue line, in m
38、m. 5 Principle The shear strength of adhesive bonds is determined by applying a longitudinal tensile force to a single lap joint with close contact or thick glue lines between two rectangular wooden adherends made of beech (Fagus sylvatica L). The joints are loaded to rupture. 6 Apparatus The testin
39、g machine shall be either: a) capable of maintaining a constant rate of loading of (2,0 0,5) kN/min; or b) capable of maintaining constant crosshead speed as described in ISO 5893. The jaws of the testing machine shall grip the test pieces firmly and prevent slippage during loading. The grip shall b
40、e fixed in hinged manner. 7 Method 7.1 Preparation of panels By planing, prepare a sufficient number (see 7.4) of panels to be bonded, with or without 14 mm wide grooves as shown in Figure 1, from an untreated straight-grained board of beech (Fagus sylvatica L.) with a density of (700 50) kg/m at (1
41、2 1) % moisture content. Ensure that the angle, , between the growth rings and the surface to be bonded, see Figure 3 a), is between 30 and 85. BS EN 302-1:2013EN 302-1:2013 (E) 8 Cut the panels across the direction of the grain to a length of at least 300 mm with the necessary allowance for cross-c
42、utting (saw blade thickness) and along the grain to a width of at least 130 mm with the necessary allowance for the width of cut as shown in Figure 1. For tests on close contact glue lines, use two panels of (5,0 0,1) mm. For tests on thick glue lines, use one (5,0 0,1) mm thick panel and one (5,0 0
43、,1)+h mm thick panel. Make grooves with a depth h between 0,3 mm and 2,0 mm and a width of approximately 14 mm that end 5 mm from the side edges (see Figure 1). Condition the panels at a temperature of (20 2) C and (65 5) % RH, referred to subsequently as “the standard climate”. Dimensions in millim
44、eters Key h depth of groove for thick glue line b width of test pieces, (20,0 0,1) mm l1length of test pieces, (150 5) mm l3width of groove for thick glue line, 14 mm (l3=0 for close contact glue lines) t thickness of panel for close contact glue line, (5,0 0,1) mm t + h thickness of panel outside t
45、he grooves for thick glue line, in mm Figure 1 Example of a bonded panel marked for division into individual test pieces 7.2 Preparation of the bonded assemblies 7.2.1 Wood adherends and bonding procedure Prepare and bond the assemblies in standard climate using the requested glue line thickness. No
46、t more than 24 h before bonding, either lightly plane or lightly sand each surface to be bonded (using an abrasive paper of grain size P100 as defined in ISO 6344-2). Remove any dust carefully. Do not touch or soil the prepared surfaces. Comply with the adhesive manufacturers instructions regarding
47、the processing conditions, including the mixing of adhesive with the hardener, the spreading of the adhesive mix, the open and closed assembly time and duration of the assembly pressure, and report them in the test report. For thick glue lines, only adhesives BS EN 302-1:2013EN 302-1:2013 (E) 9 whos
48、e components have been previously mixed are suitable. After adhesive application, and before pressure application, the board shall be put together as shown in the lower part of Figure 1 and in Figure 2. Bond the panels at standard climate with a clamping pressure of (0,8 0,1) N/mm uniformly distribu
49、ted over the bonded surface, or as recommended by the adhesive manufacturer. 7.2.2 Close contact glue Bond two 5 mm thick panels as shown in Figure 1 under pressure to produce a 10 mm thick bonded assembly. The panels shall be assembled with the correct orientation of the annual growth rings. This can be achieved by assembling as shown in Figure 2 and the lower part of Figure 3 a). Figure 2 Bonding of panels with close contact joint 7.2.3 Thick glue lines
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